drm/amd/display: Partition DPCD address space and break up transactions

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[WHY]
SCR for DP 2.0 spec says that multiple LTTPRs must not be accessed in a
single AUX transaction.
There may be other places in future where breaking up AUX accesses is
necessary.

[HOW]
Partition the entire DPCD address space into blocks. When an incoming AUX
request spans multiple blocks, break up the request into multiple requests.

Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Wesley Chalmers 2021-04-08 15:51:11 -04:00 • committed by Alex Deucher

parent 95ad72f4ad

commit 9cf9498f66

2 changed files with 102 additions and 2 deletions

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17

include/drm/drm_dp_helper.h

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